The LNB (Low Noise Blocker) on a digital satellite is the part of the satellite dish that pulls in the signal that the dish itself gathers from the satellites in orbit. It will take in the information and send it to your digital satellite receiver for processing. Most LNB's have multiple connections for your coaxial cables and have the ability to pull in multiple signals from different satellites, giving you more information for better picture and sound, more channels and the ability to run multiple receivers off one dish independently.
Pull the coaxial cables running to the dish through the LNB arm attached to the dish. Start at the hollow end of the arm closest to the dish and push the cables through the arm until they come out the top.
Attach the coaxial cables to the outputs on the LNB. These outputs look just like the coaxial cable output that is coming from your wall. Twist the end of the cable clockwise until the cable is secured to the output. Depending on what kind of LNB you are installing you could be connecting up to four different cables to the LNB. Connect every cable that is run to the satellite dish to the LNB.
Slide the LNB over the LNB arm and match up the screw holes on the arm with the screw holes on the LNB.
Slide a screw through the holes on the LNB and the LNB arm using the hardware that came with the LNB. Some LNB's will have one screw to attach the LNB and some will have two holes for two screws. If your LNB has two sets of screw holes, place a second screw through the holes.
Place a nut on the end of the screw that is coming out of the screw hole and tighten it down until it holds the LNB bracket into place. If you have two screws, attach a nut to the second screw and tighten.